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Speaking on the ITV2 show, both Kellie and band mate Jessica Taylor admitted that they were able to stay slim during their time in the band due to their fast metabolisms, while Michelle's weight always fluctuated.

'Jess and I would eat takeaways, burgers and never put on weight, that's why Michelle found it so hard,' added Kelli.

Gearing up for the catsuit: Kellie has admitted that she's worried about squeezing back into the 'tight' clothes that Michelle and Jessica want to wear

Under pressure: Kelli, who found it easy to stay slim during the band's heyday, gave birth to twins just seven months ago

But although the stars were body-confident back then, it seems that they're now worried about squeezing back into the skintight outfits they became known for.

'We had such fast metabolisms then, but I know that people will scrutinise and compare us to how we looked back then because it's such an image-conscious industry, so we want to look our best,' Jessica told the magazine.

Although Kelli was able to eat pretty much whatever she wanted during her time in the band, after they split in 2007 she began to struggle with her weight.

'Fast metabolism': Kelli used to eat whatever she liked when the band was at its peak, thanks to her metabolism

Speaking to Closer Magazine back in 2009, Kellie admitted that she'd put on and lost a whole two stone in just two years.

'When I was in Liberty X, I weighed between eight-and-a-half stone and nine stone, but a year after the split I had gone up to 10-and-a-half stone and a size 12,' she said

‘I didn’t look “fat” because I’m tall, but I was flabby and untoned and I had a paunch where my six-pack used to be. My 25in waist jeans wouldn’t even go past my knees.’

The star quickly lost the weight and toned up, but is now struggling to shift the last few post-baby pounds in the run up to the reunion gig.

All of the acts featured on the ITV2 show will play 12 dates in May, kicking off in Sheffield.

Iconic look: The Liberty X girls were known for their PVC catsuits, which they wore in 2002